Cane Creek Slamset Headset - Zero Stack 44/28.6, Zero Stack 56/40 – Grit Cycles
Chris King Inset i2 44/56mm Headset -BikeCo.com
FUNN CNC Bearing Bicycle MTB Headset 44 56 Integral 42 52 Road Bike 28.6 1 1/8" 1.5" 40MM Tape Steer Tube Intergrated Head Parts|Bicycle Headset| - AliExpress
ZS44/ZS56 – White Industries
Bicycle Bearing headset 34/42/42-52/44/44-55/44-56mm Mountain bike tapered headset bearings bowl set tapered head tube bowl set - Price history & Review | AliExpress Seller - Anto Bike Store | Alitools.io
Wolf Tooth GeoShift Performance Angle Headset - 1 Deg Long ZS44/EC49 B – Ride Bicycles